﻿new 
  Mammals 
  from 
  the 
  Lower 
  Amazons. 
  607 
  

  

  ordinary 
  grizzled 
  greyish, 
  at 
  most 
  with 
  a 
  slight 
  rufous 
  

   suffusion. 
  

  

  I 
  have 
  2*reat 
  pleasure 
  in 
  naming 
  this 
  beautiful 
  monkey 
  in 
  

   honour 
  of 
  Fraulein 
  Dr. 
  E. 
  Snethlage, 
  by 
  whose 
  personal 
  

   efforts 
  our 
  knowledge 
  of 
  the 
  mammalogy 
  of 
  the 
  Lower 
  

   Amazons 
  is 
  being 
  so 
  rapidly 
  increased. 
  

  

  Mesomys 
  stimulate, 
  sp. 
  n. 
  

  

  Smaller 
  than 
  M. 
  ecaudatus, 
  and 
  with 
  shorter 
  muzzle. 
  

  

  General 
  characters 
  as 
  in 
  M. 
  ecaudatus, 
  from 
  which 
  I 
  think 
  

   " 
  Echfmys 
  ferrugineus 
  ," 
  Giinth., 
  cannot 
  be 
  separated 
  *. 
  Size 
  

   rather 
  smaller. 
  Colour 
  above 
  rather 
  paler 
  and 
  more 
  buffy, 
  

   but 
  the 
  difference 
  is 
  not 
  great. 
  Below, 
  however, 
  instead 
  of 
  

   the 
  whole 
  under 
  surface 
  being 
  uniformly 
  buffy, 
  the 
  throat, 
  

   axilla?, 
  centre 
  of 
  chest, 
  and 
  inguinal 
  region 
  are 
  white, 
  while 
  

   the 
  belly 
  is 
  more 
  fawn-coloured. 
  Whiskers 
  and 
  long 
  hairs 
  

   round 
  ears 
  blackish. 
  Hands 
  and 
  feet 
  drabby 
  whitish, 
  without 
  

   buffy 
  suffusion. 
  Tail 
  uniformly 
  brown, 
  thinly 
  tufted 
  

   terminally. 
  

  

  Skull 
  smaller 
  than 
  that 
  of 
  M. 
  ecaudatus, 
  the 
  difference 
  

   being 
  almost 
  entirely 
  due 
  to 
  the 
  considerable 
  shortening 
  of 
  

   the 
  muzzle. 
  Nasals 
  shorter 
  than 
  in 
  ecaudatus, 
  parallel-sided 
  

   mesially, 
  narrowed 
  in 
  front, 
  instead 
  of 
  "being 
  decidedly 
  

   broader 
  anteriorly 
  than 
  posteriorly. 
  Supraorbital 
  edges 
  well 
  

   developed. 
  Bulke 
  decidedly 
  smaller 
  than 
  in 
  ecaudatus, 
  their 
  

   antero-internal 
  corner 
  not 
  projecting 
  angularly 
  forwards. 
  

  

  Teeth 
  as 
  in 
  ecaudatus. 
  

  

  Dimensions 
  of 
  the 
  type 
  (measured 
  in 
  flesh) 
  : 
  — 
  

  

  Head 
  and 
  body 
  158 
  mm. 
  ; 
  tail 
  122 
  • 
  hind 
  foot 
  29 
  ; 
  

   ear 
  13. 
  

  

  Skull 
  : 
  greatest 
  length 
  41 
  ; 
  condylo-incisive 
  length 
  o6 
  # 
  8 
  ; 
  

   zygomatic 
  breadth 
  21*6; 
  nasals 
  11*5x4*3; 
  interorbital 
  

   breadth 
  11*5; 
  breadth 
  of 
  brain-case 
  17*3; 
  palatilar 
  length 
  

   13'6 
  j 
  diastema 
  9; 
  palatal 
  foramina 
  4; 
  upper 
  molar 
  

   series 
  6'6. 
  

  

  Hah. 
  Cameta, 
  Lower 
  Tocantins. 
  

  

  Type. 
  Old 
  female. 
  B.M. 
  no. 
  11.4.28.29. 
  Original 
  

   number 
  69. 
  Obtained 
  14th 
  February, 
  1911, 
  by 
  Fraulein 
  Dr. 
  

   E. 
  Snethlage. 
  

  

  The 
  specimen 
  had 
  been 
  kept 
  some 
  time 
  in 
  captivity, 
  but 
  

   the 
  differences 
  in 
  the 
  skull 
  are 
  not 
  such 
  as 
  would 
  have 
  been 
  

   affected 
  by 
  this 
  circumstance. 
  Both 
  skull 
  and 
  teeth 
  are 
  

   without 
  any 
  trace 
  of 
  disease. 
  

  

  * 
  Cf. 
  Ann. 
  & 
  Mag-. 
  Nat. 
  Hist. 
  (7) 
  xv. 
  p. 
  590 
  (1905). 
  

  

  